this second version of the series adds several cleanups that were suggested by
Stephen Boyd and contains several improvements to the seventh patch (clk: Make
clk API return per-user struct clk instances) that were suggested by him during
the review of v1.
The first six patches are just cleanups that should be desirable on their own,
and that should make easier to review the actual per-user clock patch.
The seventh patch actually moves the per-clock data that was stored in struct
clk to a new struct clk_core and adds references to it from both struct clk and
struct clk_hw. struct clk is now ready to contain information that is specific
to a given clk consumer.
The eighth patch adds API for setting floor and ceiling constraints and stores
that information on the per-user struct clk, which is iterable from struct